Fort Collins detectives traveled more than 400 miles Friday to Ogden, Utah, where they assisted the Davis County Sheriff's Office in the arrest of an 18-year-old in connection with the killing of William "Bill" Grabusky.

Dylan Joseph Thompson of Fort Collins has been arrested on suspicion of first-degree murder, tampering with a deceased human body, aggravated motor vehicle theft and unauthorized use of a financial transaction device.

As of Saturday afternoon, Thompson was in custody at the Davis County Jail in Farmington, Utah. Fort Collins Police Services did not provide information Saturday about whether he would be transported to Larimer County.

Grabusky's wife, Joann — who lives in Pennsylvania — called police Wednesday morning and asked them to check on his welfare because she said she had not been able to reach him in several weeks.

When police arrived at Grabusky's apartment in the 3400 block of Riva Ridge Place, they found his body.

The Larimer County Coroner's Office conducted an autopsy Thursday morning and ruled the death a homicide, but the office has not released information about how or when Grabusky died. More information will be released when the coroner's office gains a better understanding of the timeframe of the events through the investigation, spokeswoman Debbie Reisdorff said in an email earlier this week.

After police found Grabusky's body, they asked the public for help locating his missing car. It was located unoccupied in Fort Collins on Thursday.

Grabusky was a retired director of operations for a railroad company, Joann Grabusky said. His job required him to travel regularly, and he was often moved to new posts across the country.

Joann Grabusky said she did not want to uproot their 30-year-old son, who has a disability, and take him away from his medical care and home, so she and her husband decided to live separately.

"I don't know what the heck the motive was, but I am still shocked," she said Saturday. "I can't even think straight. It's so stressful because I don't know what happened."

She said she did not know Thompson, nor did she know anything about him.

Joann Grabusky described her husband as a quiet man who loved politics and his family. He always made sure that she and their son had everything they needed, she said.

She called Fort Collins police after Grabusky stopped returning her calls and messages. It was unlike him not to get back to her quickly, she said.

She said by Wednesday evening, she knew that police had found a body in her husband's apartment and they believed it was his.

"He's a very gentle man," she said. "He did not deserve this."

Fort Collins Police Services is asking anyone with information related to this case is to call Detective Jason Curtis at 970-416-2441 or Larimer County Crime Stoppers at 970-221-6868. Callers can remain anonymous and might be eligible for a cash reward.

Homicides in Larimer County

2017 year to date: 5 (3 fatal police shootings)

2016: 11 (2 fatal police shootings)

2015: 7 (3 fatal police shootings)

2014: 6 (1 fatal police shooting)

2013: 4 (1 fatal police shooting)

*Even though officers have been cleared of criminal wrongdoing in police shootings, the suspect's death is still ruled a homicide by the coroner's office.

This is a developing story, check back with Coloradoan.com for updates.